Abstract
The modifiers NTC (nano-TiO2/CaCO3) and BF (basalt fiber) were adopted to modify a base matrix asphalt mixture. The base matrix asphalt mixture and three kinds of modified asphalt mixture under F–T (freeze–thaw) cycles were scanned by computed tomography. The air voids and morphological changes of asphalt mixture were summarized by image processing technology, and the development process of F–T damage to asphalt mixture was explained from a micro-view. The porosity of NTC-modified asphalt mixture changed little, and the void distribution between base matrix asphalt mixture and NTC-BF (nano-TiO2/CaCO3 and basalt fiber) composite modified asphalt mixture was more uniform. The macro-pores in the asphalt mixture under 15 F–T cycles began to connect gradually, and the pore characteristics also changed. The number and shape of the pores changed under 15 F–T cycles. According to the state characteristics, the change amplitude of the pore characteristics of matrix asphalt mixture and NTC-BF composite modified asphalt mixture were the most stable under F–T cycles.
Highlights
Heavy traffic volumes require ongoing improvements in the performance of asphalt pavement
basalt fiber (BF)-modified asphalt mixture show the characteristics of pore fluctuation at both ends and stability in modified asphalt mixture show the characteristics of pore fluctuation at both ends and stability in the the middle, while the pore distributions of the base matrix asphalt mixture and NTCA-BF composite modified asphalt mixture are more uniform
The results show that the pore distribution of the base matrix asphalt mixture and nano-TiO2 /CaCO3 (NTC)-BF composite modified asphalt mixture are more uniform before the F–T cycle
Summary
Heavy traffic volumes require ongoing improvements in the performance of asphalt pavement. Tests show that the modification of asphalt mixture with nano-materials and basalt fibers can significantly improve and prolong pavement performance. The results showed that basalt fiber can significantly improve the crack resistance of asphalt mortar [5]. The results showed that basalt fiber can significantly improve the tensile strength of asphalt mixture [6]. The results showed that basalt fiber could improve the low temperature performance of asphalt mixture [8]. The base matrix asphalt mixture, nano-TiO2 /CaCO3 (NTC)-modified asphalt mixture, changes in the internal structure of the asphalt mixture samples were analyzed by X‐ray tomography basalt fiber (BF)-modified asphalt mixture and image processing technology duringand. F–T cycles on the performance of test modified asphalt mixture were studied. Materials and of Methods performance test asphalt mixtures was analyzed from the micro point of view
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